intrusion

[ in-troo-zhuhn ]

noun

1. an act or instance of intruding.
2. the state of being intruded.
3. Law.
   1. an illegal act of entering, seizing, or taking possession of another's property.
   2. a wrongful entry after the determination of a particular estate, made before the remainderman or reversioner has entered.
4. Geology.
   1. emplacement of molten rock in preexisting rock.
   2. plutonic rock emplaced in this manner.
   3. a process analogous to magmatic intrusion, as the injection of a plug of salt into sedimentary rocks.
   4. the matter forced in.

intrusion

/ ɪnˈtruːʒən /

noun

1. the act or an instance of intruding; an unwelcome visit, interjection, etc

   an intrusion on one's privacy

2. 1. the movement of magma from within the earth's crust into spaces in the overlying strata to form igneous rock
   2. any igneous rock formed in this way
3. property law an unlawful entry onto land by a stranger after determination of a particular estate of freehold and before the remainderman or reversioner has made entry

intrusion

/ ĭn-tro̅o̅′zhən /

1. The movement of magma through cracks in underground rocks within the Earth, usually in an upward direction.
2. ◆ Rocks that form from the underground cooling of magma are generally coarse-grained (because they cool slowly so that large crystals have time to grow) and are called intrusive rocks.
3. Compare extrusion

Derived Forms

• inˈtrusional, adjective

Other Words From

• in·trusion·al adjective

Word History and Origins

Origin of intrusion¹

1250–1300; Middle English < Medieval Latin intrūsiōn- (stem of intrūsiō ), equivalent to Latin intrūs ( us ), past participle of intrūdere to intrude (equivalent to intrūd- verb stem + -tus past participle suffix, with dt < s ) + -iōn- -ion

Example Sentences

“My perspective is from the brain. What is it doing to us and how can I say no to this intrusion?”

From Los Angeles Times

School safety officers responded to multiple intrusion alarms at the campus and spotted an unknown adult emerging from one of the campus bungalows, school district officials said.

From Los Angeles Times

For presumptively immune official acts, the government may rebut the presumption by showing that prosecution would pose “no ‘dangers of intrusion on the authority and functions of the Executive Branch.’

From Slate

Those questions include whether the executive must “yield if the legislature invokes its authority—that is, would proceeding with an execution in these circumstances entail the executive branch’s intrusion into the broad authority of the legislative branch? Or, contrariwise, would allowing various committees of the legislature to subpoena an inmate who is subject to an impending death sentence constitute the legislative branch’s intrusion into the orderly functioning of the law, risking manipulation of the judicial process and the executive function?”

From Slate

While merry on the surface, Spirit Halloween’s intrusion into the Christmas season is an indicator of the perennial battle facing brick-and-mortar establishments in the digital age—especially when it comes to the attention economy.

From Slate

Related Words

• encroachment
• imposition
• incursion
• interference
• intervention
• invasion